JP2861063B2 - Individual reception method of mass media information by radio wave - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an individual reception system for providing mass media information such as newspapers to only a subscriber using radio waves.

(Prior Art) Conventionally, when providing mass media information only to individual subscribers online, it was necessary to secure a 1: 1 line using a telephone line or the like.

(Problems to be Solved by the Invention) However, in this conventional method, (1) the line cost is high, and (2) the transmission must be repeated by the number of users, so that transmission to all the subscribers is completed. It took a long time before.

Therefore, there was a disadvantage that the application became more difficult as the number of contractors increased.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned drawbacks, and it is possible to simultaneously distribute to a large number of subscribers at a low cost regardless of the increase in the number of subscribers, and to separate mass media information by radio waves which can sufficiently prevent theft reception. It is to provide a receiving system.

(Means for Solving the Problems) In order to achieve the above object, an individual reception method of mass media information by radio waves according to the present invention is an individual reception method of mass media information by radio waves comprising a distribution device and a large number of receivers. Wherein the delivery-side device is configured to transmit a radio wave including an identification code indicating a type of mass media information and an information signal encoded by a predetermined code, The apparatus has an antenna that receives a radio wave from the distribution device, an identification code detector that detects an identification code included in the received radio wave, and an identification code that is detected by the identification code detector. A rewritable memory circuit for storing a decryption code, a matching pattern, and a password, and a decryption code read from the memory circuit. First decoding the identification code detected by the identification code detector.
A comparator for comparing the output of the first decoder with the matching pattern read from the memory circuit, and a second decoder for decoding an information signal received based on the decoding code read from the memory circuit. A first gate unit that gates the output of the second decoder in accordance with the match / mismatch signal of the comparator and an unspecified number of persons receiving the identification code detected by the identification code detector, such as a normal TV signal. In the case of a code that can be received, a gate means comprising a second gate section for directly gating the received information signal, a terminal for receiving a password from the distribution side device by a different route from the antenna, and a terminal directly connected to the receiver. A terminal for inputting a password, and using the password input from the terminal as a key, a solution stored in the memory circuit is used. And a code and a matching pattern rewritable the decryption code and a matching pattern transmitted from the another path memory writing device.

Note that the password is used when the side that distributes the mass media information rewrites the decoding code and the matching pattern stored in the memory circuit of the individual receiver using a telephone line or the like.

Hereinafter, the present invention will be described in more detail with reference to the drawings.

FIG. 1 shows an embodiment of an individual receiving system according to the present invention, which is an example in which the present invention is applied to a TV wave and a TV receiver.

The TV radio wave 15 is emitted from the distribution side device 16 and is input to the identification code detector 3 through the antenna 1 and the tuner 2.

FIG. 2 is a diagram showing a configuration of one screen of a TV signal. In this embodiment, an identification code is inserted into the first frame signal.

The identification code is 0 for a normal TV signal, and is not 0 for a TV signal that can only be individually received by a subscriber.

In the case of a normal TV signal, since the identification code detector 3 outputs 0, the output of the NOR gate 4 becomes 1 and the AND gate 11 passes the video signal.

The video signal is input to the image receiving circuit 13 through the OR gate 12, and is displayed on the CRT 14.

In the case of a TV signal which can be individually received only by the subscriber, the TV signal is indexed with the detected identification code as shown in FIG.
The decoding code on the memory circuit 6 is read. Decoder 7
Decrypts the identification code in accordance with the decryption code, and compares the decoded signal with the matching signal read from the memory circuit 6 by the comparator 8.

As a result of the comparison, if they match, the output of the comparator becomes high level, and the AND gate 10 allows the video signal decoded by the decoder 9 to pass.

Thereafter, the video signal passes through the OR gate 12 and the image receiving circuit 13
And is displayed on CRT14.

To rewrite the decryption code and the matching pattern in the memory circuit, a memory write request is sent from the distribution device via a telephone line.

The memory write request is, for example, a protocol such as CCITT-V42, and the memory writer 5 has the same protocol.

The memory writer 5 receives the memory write request sent from the distribution device 16 and checks whether the password sent next and the password read from the memory circuit 6 match.

After confirming that the passwords match, the memory writer 5
Subsequently, the decryption code and the matching pattern sent from the distribution device 16 are written in the memory circuit 6.

The password can be written in another way.

(Effect of the Invention) Since the present invention is configured as described above, it has the following advantages.

(1) By using radio waves, the distribution cost does not increase even if the number of subscribers increases.

(2) Distribution can be made to many contractors at the same time.

(3) The decryption code can be freely changed by the distribution side of the mass media information, thereby preventing theft reception.

(4) The password can be freely changed on the receiving side if the distribution side device is notified, so that the memory cannot be rewritten by a third party.

[Brief description of the drawings]

FIG. 1 is a circuit diagram showing an embodiment of the individual receiving system according to the present invention. FIG. 2 is a diagram showing the structure of a TV signal for one screen in the present invention, and FIG. 3 is a diagram showing the contents stored in a memory circuit. DESCRIPTION OF SYMBOLS 1 ... Antenna, 2 ... Tuner 3 ... Identification code detector, 4 ... NOR gate 5 ... Memory writer, 6 ... Memory circuit 7, 9 ... Decoder, 8 ... Comparator 10, 11 ... … AND gate 12… OR gate, 13… Image receiving circuit 14… CRT, 15… Radio wave 16… Distribution side device

Claims (1)

(57) [Claims] 1. An individual mass media information receiving system using radio waves, comprising a distribution device and a plurality of receivers, wherein the distribution device has an identification code indicating a type of mass media information, and a predetermined code. The receiver is configured to transmit a radio wave including an information signal encoded by the received code, the receiver includes: an antenna that receives a radio wave from the distribution device; and an identification code included in the received radio wave. An identification code detector to be detected; a rewriteable memory circuit for storing a decryption code, a matching pattern and a password read out using the identification code detected by the identification code detector as an index; A first decoder for decoding an identification code detected by the identification code detector based on the decoded code, A comparator for comparing the received information signal with a matching pattern read from the memory circuit; a second decoder for decoding a received information signal based on a decoding code read from the memory circuit; When the identification code detected by the first gate unit that gates the output of the second decoder and the identification code detector is a code that can be received by an unspecified number of persons, such as a normal TV signal,
A gate unit comprising a second gate unit for directly gated the received information signal; a terminal for receiving a password from the distribution-side device via a path different from the antenna; and a terminal for inputting a password directly to the receiver. A memory which has a password input from the terminal as a key, and which can rewrite the decoding code and the matching pattern stored in the memory circuit with the decoding code and the matching pattern sent from the different path. An individual reception method of mass media information by radio waves, characterized by having an embedded device.